State news agency TAP cites prime minister Habib Essid as saying Khaled Chaieb, also known as Abou Sakhr Lokman, was one of nine terror suspects killed overnight in an operation near the Algerian border.
Chaieb is believed to be a prominent Algerian militant in al-Qaeda’s North African arm, and suspected of leading or helping lead the March 18 attack on the National Bardo Museum.
Twenty-two people, mainly foreigners, and two gunmen were killed in the March 18 attack on the National Bardo Museum.
French president François Hollande, Italian prime minister Matteo Renzi and several foreign ministers and legislators from other countries joined an anti-terrorism ceremony in Tunis after the march.
“We must all fight against terrorism,” Hollande told reporters after the march. “Tunisians wanted this international solidarity.”
Renzi said: “We are here today to give a message of hope... We want to say that Tunisia does not stand alone: we are together in combatting terrorism.”
The Tunisian government called on all major political parties to join the march from the seat of government at Bab Es-Saadoun to the museum.
The international visitors are showing solidarity with Tunisia, whose fragile new democracy was deeply shaken by the museum attack, for which the Islamic State group claimed responsibility.
Tunisian protesters unleashed revolts across the region known as the Arab Spring, and Tunisia is the only country to have built a democratic system as a result.
Authorities are struggling with scattered extremist violence linked to various radical Islamic groups, largely linked to neighbouring countries Algeria or Libya.
Interior Ministry spokesman Ali Aroui said nine suspected “terrorists” were killed when security forces clashed with the suspects in the southwest region of Sidi Aich, near the Algerian border. He said several extremists were wounded in another clash in the northwest region of Kef, as part of security operations ahead of the march.